Buggy code:
public class SenseiSystemInfo implements AbstractSenseiResult { public static class SenseiFacetInfo implements Serializable { private static final long serialVersionUID = 1L ; private String _name ; private boolean _runTime ; private Map < String , String > _props ; public SenseiFacetInfo ( String name ) { } public String getName ( ) { } public void setName ( String name ) { } public boolean isRunTime ( ) { } public void setRunTime ( boolean runTime ) { } public Map < String , String > getProps ( ) { } public void setProps ( Map < String , String > props ) { } @ Override public String toString ( ) { StringBuffer buf = new StringBuffer ( ) ; buf . append ( "name:<seq2seq4repair_space>" ) . append ( _name ) ; buf . append ( "\nisRuntime:<seq2seq4repair_space>" ) . append ( _runTime ) ; buf . append ( "\nprops:<seq2seq4repair_space>" ) . append ( _props ) ; return buf . toString ( ) ; } } public static class SenseiNodeInfo implements Serializable { private static final long serialVersionUID = 1L ; private int _id ; private int [ ] _partitions ; private String _nodeLink ; private String _adminLink ; public SenseiNodeInfo ( int id , int [ ] partitions , String nodeLink , String adminLink ) { } public int getId ( ) { } public int [ ] getPartitions ( ) { } public String getNodeLink ( ) { } public String getAdminLink ( ) { } public String toString ( ) { StringBuffer buf = new StringBuffer ( ) ; buf . append ( "{id:<seq2seq4repair_space>" ) . append ( _id ) . append ( ",<seq2seq4repair_space>partitions:<seq2seq4repair_space>" ) . append ( Arrays . toString ( _partitions ) ) . append ( ",<seq2seq4repair_space>nodeLink:<seq2seq4repair_space>" ) . append ( _nodeLink ) . append ( ",<seq2seq4repair_space>adminLink:<seq2seq4repair_space>" ) . append ( _adminLink ) . append ( "}" ) ; return buf . toString ( ) ; } } private static final long serialVersionUID = 1L ; private long _searchTimeMillis ; private int _numDocs ; private long _lastModified ; private String _version ; private Set < SenseiSystemInfo . SenseiFacetInfo > _facetInfos ; private String _schema ; private List < SenseiSystemInfo . SenseiNodeInfo > _clusterInfo ; public SenseiSystemInfo ( ) { } public long getTime ( ) { } public void setTime ( long searchTimeMillis ) { } public int getNumDocs ( ) { } public void setNumDocs ( int numDocs ) { } public long getLastModified ( ) { } public void setLastModified ( long lastModified ) { } public String getSchema ( ) { } public void setSchema ( String schema ) { } public Set < SenseiSystemInfo . SenseiFacetInfo > getFacetInfos ( ) { } public void setFacetInfos ( Set < SenseiSystemInfo . SenseiFacetInfo > facetInfos ) { } public String getVersion ( ) { } public void setVersion ( String version ) { } public List < SenseiSystemInfo . SenseiNodeInfo > getClusterInfo ( ) { } public void setClusterInfo ( List < SenseiSystemInfo . SenseiNodeInfo > clusterInfo ) { } @ Override public String toString ( ) { StringBuffer buf = new StringBuffer ( ) ; buf . append ( "\t-<seq2seq4repair_space>Number<seq2seq4repair_space>of<seq2seq4repair_space>Documents:<seq2seq4repair_space>" ) . append ( _numDocs ) ; buf . append ( "\n\t-<seq2seq4repair_space>Last<seq2seq4repair_space>Modified:<seq2seq4repair_space>" ) . append ( new SimpleDateFormat ( "EEE,<seq2seq4repair_space>MMM<seq2seq4repair_space>d,<seq2seq4repair_space>''yy" ) . format ( new Date ( _lastModified ) ) ) ; buf . append ( "\n\t-<seq2seq4repair_space>Version:<seq2seq4repair_space>" ) . append ( _version ) ; if ( ( ( _schema ) != null ) && ( ( _schema . length ( ) ) != 0 ) ) <START_BUG> buf . append ( "\nschema:<seq2seq4repair_space>" ) . append ( _schema ) ; <END_BUG> buf . append ( "\n\t-<seq2seq4repair_space>Facet<seq2seq4repair_space>Information:<seq2seq4repair_space>" ) . append ( getCmdOutPutofSet ( _facetInfos ) ) ; buf . append ( "\n\t-<seq2seq4repair_space>Cluster<seq2seq4repair_space>Information:<seq2seq4repair_space>" ) . append ( _clusterInfo ) ; return buf . toString ( ) ; } private String getCmdOutPutofSet ( Set < SenseiSystemInfo . SenseiFacetInfo > facetInfos ) { } private String padString ( String input , int length ) { } private Map < String , String > sortByKey ( Map < String , String > _props ) { } }

Fix:
buf . append ( "\n\tschema:<seq2seq4repair_space>" ) . append ( _schema ) ;